Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5428cda58c487cf…

MALICIOUS

PDF

79.9 KB Created: 2021-03-18 00:22:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aa37b05dd4901ef56d50aeb9b25d1a35 SHA-1: 2c67fdca400da4715b878953e656805bca1e03c3 SHA-256: b5428cda58c487cf34c8e88afa6dc7a68cdb28246b99f4042c9bceb0328f4b3f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains multiple heuristics indicating it is a phishing lure, including a link farm and a redirector to an SEO-optimized phishing page. The ML classifier and ClamAV detection strongly suggest malicious intent. The document body, though partially corrupted, contains text related to software serial numbers, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://druttle.ru/wix?keyword=sony+sound+forge+pro+11+serial+number+and+authentication+code PDF link annotation
    • https://rorefodelubo.weebly.com/uploads/1/3/1/4/131452934/8227726.pdfIn PDF document text
    • https://sabalijazot.weebly.com/uploads/1/3/2/6/132695986/jerite.pdfIn PDF document text
    • https://bavefazetujew.weebly.com/uploads/1/3/1/4/131406687/vadavikaribolen.pdfIn PDF document text
    • https://vukujaxirebes.weebly.com/uploads/1/3/4/1/134108713/xerululoj.pdfIn PDF document text
    • https://kaxebovirufuj.weebly.com/uploads/1/3/4/3/134399635/wovat.pdfIn PDF document text
    • https://vilawamilufulob.weebly.com/uploads/1/3/6/0/136006615/2529134.pdfIn PDF document text
    • https://sojomirolasa.weebly.com/uploads/1/3/4/3/134325131/4703279.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ce2645ba-e89a-43d5-afff-5c0150757291.filesusr.com/ugd/c63dba_aad1556c55584808adf72e318466280c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0bf2773-ab8c-45a0-b4af-b4450d45ba97/the_developing_person_through_the_lifespan_10th_edition_chapter_1.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/rozibarewogojuvekavisezex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbfb052e-f7f8-4132-b703-8f56baa047a5/control_systems_engineer_salary_ireland.pdfIn PDF document text
    • https://s3.amazonaws.com/zodawanuror/how_to_use_beurer_blood_pressure_monitor_bm_26.pdfIn PDF document text
    • https://217ba8a6-026c-4a9e-b1ce-2eadff0a4a08.filesusr.com/ugd/3d7af5_bf0ccbe6043e47a9bb053a009ac1b23e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vitelitubovuluj/c_sharp_vs_c_performance.pdfIn PDF document text
    • https://69a7f268-727d-4112-ba4f-a3538cc856be.filesusr.com/ugd/9a0d60_543b893459dd48abbde291bd9987beb7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/29a60d57-509d-4a68-b474-289f889d3e44/microsoft_store_-_walt_whitman_shops_huntington_station.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5deaf676-e7e4-4de0-b2e2-f3993e936021/how_to_fix_lid_lock_on_speed_queen_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/teamviewer_free_for_pc.pdfIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_dfde5a905a324bfebd5a2fb83cc68cf7.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_2edfd94f97734d15b387051d2cfa6573.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vavapekadoliti/64118990727.pdfIn PDF document text
    • https://s3.amazonaws.com/varoximu/allegro_design_entry_hdl_user_guide.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 5968 bytes
SHA-256: aba7b0d55dfe15a7b3b033129edfbee00c6c3dc2bc375e315c8f7de11560b7e0
font_01_sfnt_off00010d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D30 10788 bytes
SHA-256: 4d594834c07ab26effbe696ad9ba7c4e1b01325017fcf5b8747e3e3ac0673b94